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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3a84a13450bd8e7c50b14997c11f78335a4c8d83227bc245cb372f26afc693' 
  AND token = '7ESza9wxtRkGF0JR1KViuZKjPkySMAH32TxyS1rkrg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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