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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afcb3831a026b2c8f3b5da898f13a31c7704d128cbc33b9a9d0c15601b88044' 
  AND token = 'ODc5eAZ4mo6PofFm1aXcTWoBAwhTg6TQqK0mwYUmOQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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