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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17c1cbf7bec1a0c39dfef1292565f6c73ef9c9bbf2216bf70d44c7df6a4eca1' 
  AND token = 'cre07Uvn37A5L81JPQgXM/e9XDBV79NN+vyUn5Qz5gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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