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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdbb1b64771f1e9a9d921bab74157fabf0f4ed86c7a99bc1b74255b9f1d5a72' 
  AND token = 't4Dje4GjbwmekznbDNv4z5x5qW1w6kPBaYTz/5fzzns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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