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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b967a22efba32a4feda0353558a404b754c1e64b3890939765814aebe85b61' 
  AND token = 'rMGS6/WvA/sgUc4BI4A6uGaWFsHZJhpP5KcBUHuntLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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