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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3394f50d9e8c4aee2faf195742dc56c61a705a44e4f5350c60e1f15fe1105a' 
  AND token = 'GJ4MHwmDtrfywSxYvjLC5j573Uknkt1c0mpYTQ7Wx2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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