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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914cf02652d911245faf95643b47319eafabb2023ba83ba7df53e1fcf42fd2da' 
  AND token = 'W/n1p2Qk8fEqAa9Fi78CETBT7FKevWpdoq6i8Q55578=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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