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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb2f227f09bb4330ddcd48ab6f7fbf1799ba4d8aeeb9b221b247cd9eabd2cf0' 
  AND token = 'uHE3EufJHPyD+3xd7bLqYc7PE0v2i7FuatCjIIbtsE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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