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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f18eb3f7df4ef55a41de572efe040d5e0849e0cb681e1694db1d83805b5ab70' 
  AND token = 'gEQJWE3fBjmYE6rNCyWf2ScFIYbTB3PHv/a3uQeQsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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