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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cecb3e5ac24c531c742118ced0e1b708fef7912d74abfe282e4e27dacd726c' 
  AND token = 'd/dtu3qqmlZT+Ardx7UrWh8+B1X8XAAuU5aWIJPxY7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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