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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242330d14e2b16c28253dd799f4816bd914ec28629cebca603a5265d928b8932' 
  AND token = 'gdTse3bc9AD6LbhwuldzoyEFP6lVS9qvcop88s/vRPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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