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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c6df9e710cb458c81bf8e44cf752626afb5ba1e9a0d41c869c47ef1143abe7' 
  AND token = 'ScSloGfBull1ToPijE7tdCXRhhpYIT/DUeE+avjGY7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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