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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35886e2524235600c8521ea352c60d9458d9fc32be0154f2ab601d41d38a9cd' 
  AND token = 'Tbo1/0oHT5Ff6G4bi4b0xEBpwYdz5XuVzFxrAf+3MR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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