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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdac0b9aed6b2ef3e211217b9381bab335d4eab24c5a9d3ea48eb233400bf2a' 
  AND token = '5J6oTjgFvNxcSH0CTVzDdymq7HslUvr5UBG6zHaX0Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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