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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0062baf2b2ea85ce65434e21b8f155325d56d97ff8878f151e40b094aac15a8' 
  AND token = 'gpXaa2UufiQfe/3DphJcC/qkGXZLDIULN8lkvktmx+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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