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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7da860aefb01ec5b75aa5dc414e2f8ed16122dbad6994a93f7bcefc51f0994f' 
  AND token = 'ZEi9t5x8QIyZ4JywMiH9sltBL0WFYoEwldFkmC6ihLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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