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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d661a7bed80b9a01284cca50a7cda97255e581797826a4f9eca4c413cc7a4b' 
  AND token = 'iIk6+NFc3o6XCxnJOMKmgBDalfaK39Mj97t9b69OiHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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