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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6950f4e4d8b2f5b59bcf3945c5e7be1978c2e90d8954cd5df799700e05e4969d' 
  AND token = 'zumKvf5HZ/c5m8BQNNDBVVJw44mhYF6pj6z0B18KfTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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