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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0844887898258342850fe001fd4e222f558c2514c5a0a01be802d2246120631' 
  AND token = 'zfoqLWqV1VfaBpLgytJ1f3l4Mcc54On4HWZQzVWxKSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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