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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87c5a71d7b1ba988c531b55532a8d05da42945c12a1452e8361693e92d8c60d' 
  AND token = '05f0XG2zS2179VwBdB3Fr5dnUXvrGUtZ+T82oEH2x40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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