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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a312d7e198324c2f22861974fd3c6881a63e7d35bc80192342c3d1d9fac6d3db' 
  AND token = 'juVmqhbMhnZNTXYpFOM8NsjYI2sBVWNTtqgfXN5fn6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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