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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15b911e4ca84908564dac7e0f66edf7ab35d740f5368221355584e88a3e3559' 
  AND token = 'elkg4mB6WF4VpfQz1SUyHn01H5rHS00w8n7x5JL/dGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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