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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948bc28deddc4b99c508de2a6c9d96b974e178347b518d7a32e85ed6497ee928' 
  AND token = '+3alRorlVkH0mi9sKTVWfUv8FVkwNJJ/seNCcnnGuks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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