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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c889ec7dd32ff9679c2a89b583f276a32d19a687a0f623437e56bb372baf95' 
  AND token = 'WOXj6KWZ1mrppdMXWAo+NyH27Bj3tNfzwp6WktRyALE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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