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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00b1dcf1ca0f6a5d145462db4b3fb56dc906e586f9c913caf626a178a9cf00e' 
  AND token = 'zYObUsHNiSk2WDcZk4RrpH+ckVrIJPEguu+3b2CLMcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}