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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7a03f765f8745c25b7748a99796d465d77bd07087cc543ca02d3da04455a30' 
  AND token = 'Oro82MCVuwyCGQ6feB8+L/VxW9ZPjf6UNs/Sl0BL2EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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