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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4eafc1a47d80f7b102c0e469334dd85746d210cbb4e0a1758de4b44b4225eb' 
  AND token = 'YnQvolKF/nHu/lRDnZM/fBvtMyQg0Z01Au3OcTuGz+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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