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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932786a8d9960b2be125286b3711063a3ffd71e4c43adb9b2d29aff7b5078b5' 
  AND token = 'A0Bvyy5Y9pS3AUnt/BJteM50/2hlRP7Mnn35ziFKurE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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