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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29861b0122d103cc85480b9930a521790dee85839e34e87c3473674d8bb97a50' 
  AND token = 'tMbpJqcuSU3yUdg8Pd44adPCV42WV7DqpAFTw91tbNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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