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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fc2c03b81651784d0ccf6f08838e9bd17e460f95a27bc79f344a3596bb1860' 
  AND token = 'VMzIZoNJf44vGls/9v0ENEfDtMFNW8Eow/UUW9B1k5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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