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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79542fea71a2a3b82f3fb236443cd16f42312dcf325eb5389d829de42a72113' 
  AND token = '7TqI6fk35hzctfh3eKIkrZqw+o4AqvmABIrJJqgqUWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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