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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acfdf87ee4e413e8877c47f4479f9b519afc2a7916260c0cbe058988d1d2894' 
  AND token = 'K1wEH8aK+l4Kr01ogGI0dK/gtF4Ihp9conY7YOLUzJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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