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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcf1ace8862852a3c2c554bdb26e05af9a58d80298a8a8f17f2fbfd6033b6ed' 
  AND token = 'GuSWGq1+DETp7+of8j5WPl80Z+TqqMxwUlssCccLGCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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