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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b81c0b28d8d6a0fd6b7701691c61435cd18944aa7daa6d285ffdc5fb79ad8f' 
  AND token = 'mCMVvDSBHwHwlDo14Qz8KHEL6Wn2vyTI1NOv/evUJFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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