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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280568b8fffa89883d9faf2fe1bd1711b0903525f972b8551af06bc35d3df39a' 
  AND token = 'd5JQkyU0mw++/Ov6ckHIgXol7JZnZ2kRUWHSisx1G5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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