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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d59728ba532e0c502277fd789fa56f74c674aae084e6decca0ece1c9f3e548' 
  AND token = 'q8kHH2Ds4SvBbEOZG8dZflDrUVNhxS1Nekh0bxQqEkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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