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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24053bfdbb07d196b771e35d53d1a55e5229a700cf7d6dc9225007d8697cafda' 
  AND token = 'zo/2f7F6L2uamwo6jkL1hQkWm3jIudTjbO2JXCe05rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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