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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac57b11a71b5b0cb87571d8482455ef94213ad583e4c16b1b050d5ad3aba718' 
  AND token = 'J4uEILKZ5nMs2fR7sT+jCRAI77h4fEarj7qXxJsM+dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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