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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55942225457ca371518c51dd5025349581fdd0e6d610f1e19bfdfc1a6cfbb84e' 
  AND token = 'lrwoUZGKXgTxgaTCtfjNJRVK+0P4Hh2fGn7FdO55x1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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