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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d1a6f0f8264f75dc716e5f2dcd2f24c5132c9cf177e45a4cfb2b3a8dc8d6d5' 
  AND token = '8qxdTibxFBHlgLbXz001UJr8C1kDrbVWb3T2hoJpi7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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