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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46e2cbd4d0b88f81ea7c055fd1db3463186a9b69e14cf9bb584050be1d08682' 
  AND token = 'tpYhQTAnX1nYGfr0go48PdhvbO1vYI60vK3QWHHmXc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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