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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7a61c22f7d6fc48c45472f6fb0b13585866126f469c0fea5a0815595ae4ccf' 
  AND token = 'kRAdw1ueOvtwOXqKEZSMh05/x/SN25g4YfIcx69fGGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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