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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b270a0e0e64da72047ab4e7b1a100139bc53dcd79ce3ec385bbae0796f7c11' 
  AND token = 'bE/TYF7+Ho2mWXBneOL06WG6QutdZPpu5KvccjDTR3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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