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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0764817c2b5889376894d815b60789369047ead85e45ca3ef1c851d8438ee74' 
  AND token = 'XX+HIXOcvfYjKLot8Nt67AD7qmDaxx4YpB7JEqoBNM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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