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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc839218538480a4dcae07e69d382cc1c45a9c1d978096183a533ad5976d33a0' 
  AND token = 'CannDqFNKLO+4X8S9dYgY+P7gVlS0xHwcyj2LulcE0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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