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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8daa8b8513a6a7037fa2c964e3b8de37123aacf5ed2c9f8224df381f738e3e47' 
  AND token = 'l2KIrYZzRx3Mb+VZYQeOr5MJcSOgfbEdytLieuxJhIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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