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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bde5fe43e0456e7c69f29f2401b00d81e450391ee0568c862c7df6e35f69e93' 
  AND token = 'VyJjzdjErxZlsGVPazAmwdkmxABjrYM7sopPkJ1kq8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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