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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97ed7a351e60f4e071c4d7e25bd03f5df6dab4665eae5f230bd33336719e730' 
  AND token = 'fL5zE7qINBJtb4pWP1l4TBuCKEIYybYd9nQ3f6NmUvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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