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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c008fe689fd8b2da334b2228baf9afc2b67034125a229d96d80da09f48cc5295' 
  AND token = 'AXdKAkX+2TG6n2oChR+7S6GceT/qc5N4d9xvvS3jhpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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