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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ea4901a70dbe5edf67bc455a45012606a5f75d9f555a1983ad1750b7595145' 
  AND token = '9A8K/bvS/Sa43acPr/Q+0UGeMoEzbI87eKCILEupXGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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