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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71c5fd1a91ee12c5ef4518d3f9deca9d6e806d19e2d5e6aaee6dc9833872ee2' 
  AND token = 'aEDk+XuWVFPs+Xee4WCHQTf64iYxIEIwnCfKIE+xHrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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